Kirito will be fishing in 22th floor in order to gather food each day. Nishida will be the one to teach Kirito about fishing since Nishida is an expert fisherman who lived in the 22th floor. Nishida in the real world is one of the person maintaining the SAO network. Unfortunately he was entangled everything in SAO because of his job and trapped in SAO.
Swort Art Online Episode 12 Sneak Peak